sorry, an update broke it all
the link works  now : http://www.fetedupanier.org/fete_du_panier.html

at first the map is something like 280 x 280
when hovering, it grows to 500 x 500
the markers are loaded at first, but when the map grows, only the
markers in the 280x280 area are shown

i tried to reinvoke  jmap('addFeed'  in the hovering call but it does
ot fix it
in fact, the gmap "useable" area seems to be defined for the size it
has when calling jmap(init
so my problem is how to redefine "on the fly" this useable area